1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CC_SURFACES_SURFACE_RESOURCE_HOLDER_H_ 6 #define CC_SURFACES_SURFACE_RESOURCE_HOLDER_H_ 7 8 #include "base/containers/hash_tables.h" 9 #include "base/macros.h" 10 #include "cc/resources/resource_provider.h" 11 #include "cc/resources/returned_resource.h" 12 #include "cc/surfaces/surfaces_export.h" 13 14 namespace cc { 15 class SurfaceFactoryClient; 16 17 // A SurfaceResourceHolder manages the lifetime of resources submitted by a 18 // particular SurfaceFactory. Each resource is held by the service until 19 // it is no longer referenced by any pending frames or by any 20 // resource providers. 21 class CC_SURFACES_EXPORT SurfaceResourceHolder { 22 public: 23 explicit SurfaceResourceHolder(SurfaceFactoryClient* client); 24 ~SurfaceResourceHolder(); 25 26 void ReceiveFromChild(const TransferableResourceArray& resources); 27 void RefResources(const TransferableResourceArray& resources); 28 void UnrefResources(const ReturnedResourceArray& resources); 29 30 private: 31 SurfaceFactoryClient* client_; 32 33 struct ResourceRefs { 34 ResourceRefs(); 35 36 int refs_received_from_child; 37 int refs_holding_resource_alive; 38 }; 39 // Keeps track of the number of users currently in flight for each resource 40 // ID we've received from the client. When this counter hits zero for a 41 // particular resource, that ID is available to return to the client. 42 typedef base::hash_map<ResourceProvider::ResourceId, ResourceRefs> 43 ResourceIdCountMap; 44 ResourceIdCountMap resource_id_use_count_map_; 45 46 DISALLOW_COPY_AND_ASSIGN(SurfaceResourceHolder); 47 }; 48 49 } // namespace cc 50 51 #endif // CC_SURFACES_SURFACE_RESOURCE_HOLDER_H_ 52
